3919945 has 16 divisors (see below), whose sum is σ = 5038848. Its totient is φ = 2917120.

The previous prime is 3919943. The next prime is 3919961. The reversal of 3919945 is 5499193.

3919945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3919945 - 2¹ = 3919943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3919898 and 3919907.

It is not an unprimeable number, because it can be changed into a prime (3919943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8880 + ... + 9310.

It is an arithmetic number, because the mean of its divisors is an integer number (314928).

Almost surely, 2^3919945 is an apocalyptic number.

It is an amenable number.

3919945 is a deficient number, since it is larger than the sum of its proper divisors (1118903).

3919945 is a wasteful number, since it uses less digits than its factorization.

3919945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 560.

The product of its digits is 43740, while the sum is 40.

The square root of 3919945 is about 1979.8850976761. The cubic root of 3919945 is about 157.6739658344.

The spelling of 3919945 in words is "three million, nine hundred nineteen thousand, nine hundred forty-five".